Coffee machine



FIG. 1 is a perspective view of a coffee machine showing my new design;

FIG. 2 is a front view of the coffee machine illustrated in FIG. 1;

FIG. 3 is a rear view of the coffee machine illustrated in FIG. 1;

FIG. 4 is a side elevational view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom plan view thereof.

The ornamental design for a coffee machine, as shown.